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Question

Factorise:
(x32x25x+6)

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Solution

Let f(x)=x32x25x+6
f(1)=132125×1+6=125+6=0
Using synthetic division, we have
x2x6=0 is the other factor
(x1)(x2x6)=0
=(x1)(x23x+2x6)=0
=(x1)(x(x3)+2(x3))=0
=(x1)(x+2)(x3) are the factors of f(x)

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